CrunchLease

CAM Charges Calculator

Estimate your pro-rata CAM per SF and per month — then reconcile it against the year-end actuals.

SF
Gross leasable area of the whole property — the denominator of your pro-rata share.
SF
Management/admin fee landlords add to CAM, typically 10–15%.
%
$/yr
%/yr
years

Estimated CAM (year 1)

Pro-rata share
10.00%
Tenant CAM / year
$13,750
CAM / SF / yr
$5.50
CAM / month
$1,145.83
CAM projection, uncapped vs capped
YearUncapped $/yrBilled $/yr$/SF
1$13,750$13,750$5.50
2$14,300$14,300$5.72
3$14,872$14,872$5.95
4$15,467$15,467$6.19
5$16,086$16,086$6.43

Benchmarks reviewed 2026-07-08.

What CAM charges cover

Common area maintenance (CAM) charges are your share of the cost to run the parts of a property everyone uses — parking lots, landscaping, lighting, snow removal, common-area utilities, security, and janitorial. Landlords estimate the annual budget, bill tenants monthly, then reconcile against actual costs at year end. CAM is one of the three “nets” in a triple net lease.

How pro-rata share works

Your share is your leased area divided by the building’s gross leasable area (GLA):

pro-rata share = tenant SF / building GLA
tenant CAM     = total CAM × (1 + admin fee) × pro-rata share

A 2,500 SF tenant in a 25,000 SF building carries a 10% share. On a $125,000 CAM budget with a 10% admin fee, that’s $13,750/year — $5.50/SF/yr, or $1,145.83/month.

CAM caps: how an annual cap limits increases

A cap ceilings how much your CAM can rise year over year. Turn on the annual cap and set a percentage — each year’s billed CAM is limited to the prior year plus that cap, and the projection shows your savings versus the uncapped path. Caps usually apply to controllable CAM only (not taxes, insurance, snow, or utilities), so read the lease for what’s actually covered.

Reconciliation: why your year-end bill differs

You pay estimates all year; the landlord trues them up against actual costs. If actuals came in higher, you owe the difference; if lower, you get a credit. Switch to Reconcile mode to compare your share of the actual budget against what you paid.

Typical CAM ranges & admin fees

Directional US ranges, market-dependent rather than fixed (Appendix A.5): CAM commonly runs $1.00–$6.00/SF/yr for retail — fixed-rate CAM is often around $4.25/SF/yr — and lower for industrial, with an admin fee of 10–15% (a well-established norm). To see CAM alongside base rent, taxes, and insurance, use the NNN Lease Calculator; to model how rent itself steps up, see the Rent Escalation Calculator; and to value the building behind the lease, the Cap Rate Calculator.

Frequently asked questions

What is included in CAM charges?

CAM covers the cost of operating shared areas: parking lot upkeep and repaving, landscaping, snow removal, common-area lighting and utilities, security, and janitorial for common spaces. Many leases also fold in a management/admin fee. What counts as CAM — and what is excluded or capped — is defined by your lease, so the specifics vary deal to deal.

How is my pro-rata share calculated?

Your pro-rata share is your leased square footage divided by the building's gross leasable area (GLA). A 2,500 SF suite in a 25,000 SF building is a 10% share, so you pay 10% of the CAM budget (plus any admin fee). Some leases use a different denominator or gross-up for vacancy — check how GLA is defined.

What is a CAM reconciliation?

You pay estimated CAM monthly during the year. After year-end, the landlord compares the estimates to actual costs and issues a reconciliation — a true-up bill if actuals were higher, or a credit if lower. Review the reconciliation statement against the budget and your lease's exclusions and caps before paying.

What is a typical CAM admin fee?

Administrative or management fees on CAM commonly run 10–15% of the CAM total, though the percentage and what it applies to are negotiable. Watch for fees stacked on top of a separate management fee, or applied to non-controllable costs like taxes and insurance — those are worth pushing back on.

Can I negotiate a CAM cap?

Often yes. A cap limits how much controllable CAM can rise each year — commonly 3–5%. Caps come in cumulative and non-cumulative flavors, and usually exclude uncontrollable items like taxes, insurance, snow, and utilities. Confirm which costs the cap covers; a cap that excludes the fastest-growing line items offers less protection than it appears.

Related calculators

Triple Net (NNN) Lease Calculator Add base rent, taxes, insurance, and CAM to see the true all-in cost of an NNN lease. Rent Escalation Calculator Project year-by-year rent growth under fixed %, step, CPI, or custom escalations. Cap Rate Calculator Solve cap rate, value, or required NOI, and stress-test value with a sensitivity matrix.